SF: Fix UAF on every resolution switch

Because resolution switching destroys the DisplayDevice, the commit that
finalizes the modeset dereferences stray pointers to its FrameTargeter.
Fix this by bailing out and committing again.

Fixes: 352197706
Flag: EXEMPT bugfix
Test: No SEGV_MTESERR crash on caiman with eng build
Change-Id: I7ad3b5f44041e5307781c826d11057b12913b58d